Exhibit 10(f)

FIRST AMENDMENT TO OFFICE LEASE

THISFIRST AMENDMENT TO OFFICE LEASE(this "First Amendment") is made as of the 1st day of July,
2004 by and betweenTDC CANADA, INC., a Canadian corporation andWACKER GP, INC., a
Delaware corporation (collectively, "Landlord") andQUIXOTE CORPORATION, a Delaware corporation
("Tenant"),

WITNESSETH:

A.    Landlord
and Tenant entered into a certain office lease (the "Lease") dated August 30, 2003, whereby Landlord leased to Tenant certain premises (the "Original
Premises") consisting of 18,789 rentable square feet of office space on the eleventh (11th) floor (Suite 1100) of that certain office building located at 35 East Wacker Drive,
Chicago, Illinois, for a lease term to expire on February 28, 2019.

B.    Landlord
and Tenant desire to amend the Lease to reflect the lease by Landlord to Tenant of certain additional space located on the eleventh (11th) floor of
the aforesaid building, subject to the terms and conditions hereinafter set forth.

NOW, THEREFORE,for good and valuable consideration, the receipt and legal sufficiency of which are hereby acknowledged, Landlord and
Tenant hereby agree as follows:

1.Definitions.Each capitalized term used in this First Amendment shall have the same
meaning as is ascribed to such capitalized term in the Lease, unless otherwise provided for herein.

2.First Additional Space.



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FIRST ADDITIONAL SPACE (125 RSF)

PERIOD

MONTHLY
BASE RENT

ANNUAL
BASE RENT

ANNUAL BASE
RENT PER RSF7/1/04 - 2/28/05

$
255.21

$
2,041.68
(8 months)

$
24.503/1/05 - 2/28/06


260.42


3,125.00


25.003/1/06 - 2/28/07


265.63


3,187.50


25.503/1/07 - 2/29/08


270.83


3,250.00


26.003/1/08 - 2/28/09


276.04


3,312.50


26.503/1/09 - 2/28/10


281.25


3,375.00


27.003/1/10 - 2/28/11


286.46


3,437.50


27.503/1/11 - 2/29/12


291.67


3,500.00


28.003/1/12 - 2/28/13


296.88


3,562.50


28.503/1/13 - 2/28/14


302.08


3,625.00


29.003/1/14 - 2/28/15


307.29


3,687.50


29.503/1/15 - 2/29/16


312.50


3,750.00


30.003/1/16 - 2/28/17


317.71


3,812.50


30.503/1/17 - 2/28/18


322.92


3,875.00


31.003/1/18 - 2/28/19


328.13


3,937.50


31.50




3.Broker.Tenant represents to Landlord that Tenant has not dealt with any real estate
broker, salesperson or finder in connection with this First Amendment, and no such person initiated or participated in the negotiation of this First Amendment or is entitled to any commission in
connection herewith. Tenant hereby agrees to indemnify, defend and hold Landlord, its property manager and their respective agents and employees harmless from and against any and all liabilities,
claims, demands, actions, damages, costs and expenses (including attorneys' fees) arising from either (a) a claim for a fee or commission made by any broker claiming to have acted by or on
behalf of Tenant in connection with this First Amendment, or (b) a claim of, or right to, lien under the Statutes of Illinois, relating to real estate broker liens with respect to any broker
retained by Tenant. Landlord agrees to pay any commissions owing to the Broker by reason of this First Amendment pursuant to separate agreement between Landlord and the Broker.

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4.Anti-Terrorism Representation.Neither Tenant nor any of its affiliates
or constituents nor, to the best of Tenant's knowledge (without independent investigation or inquiry), any brokers or other agents of same, have engaged in any dealings or transactions, directly or
indirectly (i) in contravention of any U.S., international or other money laundering regulations or conventions, including, without limitation, the United States Bank Secrecy Act, the United
States Money Laundering Control Act of 1986, the United States International Money
Laundering Abatement and Anti-Terrorist Financing Act of 2001, Trading with the Enemy Act (50 U.S.C. §1 et seq., as amended), or any foreign asset control regulations of the
United States Treasury Department (31 CFR, Subtitle B, Chapter V, as amended) or any enabling legislation or executive order relating thereto, or (ii) in contravention of Executive Order
No. 13224 dated September 24, 2001 issued by the President of the United States (Executive Order Blocking Property and Prohibiting Transactions with Persons Who Commit, Threaten to
Commit, or Support Terrorism), as may be amended or supplemented from time to time ("Anti-Terrorism Order") or on behalf of terrorists or terrorist organizations, including those persons
or entities that are included on any relevant lists maintained by the United Nations, North Atlantic Treaty Organization, Organization of Economic Cooperation and Development, Financial Action Task
Force, U.S. Office of Foreign Assets Control, U.S. Securities & Exchange Commission, U.S. Federal Bureau of Investigation, U.S. Central Intelligence Agency, U.S. Internal Revenue Service, or
any country or organization, all as may be amended from time to time. Neither Tenant nor any of its affiliates or constituents nor, to the best of Tenant's knowledge, any brokers or other agents of
same, (i) are or will be conducting any business or engaging in any transaction with any person appearing on the U.S. Treasury Department's Office of Foreign Assets Control list of restrictions
and prohibited persons, or (ii) are a person described in section 1 of the Anti-Terrorism Order, and to the best of Tenant's knowledge (without independent investigation or
inquiry), neither Tenant nor any of its affiliates have engaged in any dealings or transactions, or otherwise been associated with any such person. If at any time this representation becomes false
then it shall be considered a default under the Lease, as amended hereby, and Landlord shall have the right to exercise all of the remedies set forth in the Lease in the event of a default or to
terminate the Lease immediately.

5.Submission.Submission of this First Amendment by Landlord to Tenant for examination
and/or execution shall not in any manner bind Landlord and no obligations on Landlord shall arise under this First Amendment unless and until this First Amendment is fully signed and delivered by
Landlord and Tenant; provided, however, the execution and delivery by Tenant of this First Amendment to Landlord shall constitute an irrevocable offer by Tenant on the terms and conditions herein
contained, which offer may not be revoked for fifteen (15) days after such delivery.

6.Limitation of Liability.The provisions of Section 23 of the Lease are
incorporated herein by this reference and shall expressly apply with respect to this First Amendment.

7.Binding Effect.The Lease, as heretofore and hereby amended, shall continue in full
force and effect, subject to the terms and provisions thereof and hereof. This First Amendment shall be binding upon and inure to the benefit of Landlord, Tenant and their respective successors and
permitted assigns.

8.Conflict.In the event of any conflict between the terms of the Lease and the terms
of this First Amendment, the terms of this First Amendment shall control.

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IN WITNESS WHEREOF, this First Amendment is executed as of the day and year aforesaid.

| | TENANT:                                   
| | ------------------------------------------
| | QUIXOTE CORPORATION,a Delaware corporation
| | By:                                       
| | Title:                                    
| | LANDLORD:                                 
| | TDC CANADA, INC.,a Canadian corporation   
| | By:                                       
| | Title:                                    
| | WACKER GP, INC.,a Delaware corporation    
| | By:                                       
| | Title:                                    

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